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      Delirium in the elderly patient after anesthesia: associated factors Translated title: Delirio en el adulto mayor sometido a anestesia: Factores asociados

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          Abstract

          Abstract Introduction: Postoperative delirium is defined as an acute confusional state with altered levels of attention and consciousness. It presents for a short period of time with a transient and fluctuating evolution, with long-term outcomes of cognitive dysfunction. It has been observed mostly in extreme age groups and has been associated with factors that increase the risk of occurrence. Objective: To identify any factors associated with the development of postoperative delirium in the elderly following anesthesia. Materials and methods: An analytical cross-section study was conducted in elderly patients receiving anesthesia at a second-level hospital, from November 2016 to November 2017. The confusion assessment method was used based on 4 items for making the diagnosis of delirium. The data obtained were statistically analyzed with measures of central tendency, and the risk probability was estimated. Results: A total of 100 patients aged between 60 and 93 years old were studied, with postoperative delirium present in 18% of the sample. There was a statistically significant association among patients with severe pain, those with a low level of education, and those who did not have a stable partner. Conclusion: It is important to study the postoperative delirium factors to be able to identify the population at higher risk of experiencing postoperative delirium, with a view to reducing the number of long-term complications.

          Translated abstract

          Resumen Introducción: El delirio en el postoperatorio se define como un estado confusional agudo con alteraciones en la atención y conciencia. Este se presenta en un período corto de tiempo y presenta una evolución transitoria y fluctuante, con un desenlace a largo plazo en disfunción cognitiva. Se ha observado una mayor presentación en los extremos de la vida y su asociación con factores que aumentan el riesgo de presentación. Objetivo: Identificarlos factores asociados a la presentación de delirio postoperatorio del adulto mayor sometido a anestesia. Materiales y Métodos: Se realizó un estudio transversal analítico en pacientes adultos mayores sometidos a anestesia en un hospital de segundo nivel, en el periodo de Noviembre 2016 a Noviembre 2017. Se aplicó el método de evaluación de confusión (Test CAM) consistente en 4 ítems que hacen diagnóstico de delirio. Los datos obtenidos se analizaron estadísticamente con medidas de tendencia central y se calcularon probabilidades de riesgo. Resultados: Se estudiaron 100 pacientes con rango de edades entre los 60 y 93 años, obteniendo delirio postoperatorio en 18% de la muestra. Se encontró una asociación estadísticamente significativa entre los pacientes con dolor severo, aquellos que no contaban con algun grado de escolaridad y los que no contaban con una pareja estable. Conclusiones: Es importante el estudio de factores asociados a delirio postoperatorio que permitan identificar la población en más alto riesgo de desarrollarlo, buscando disminuir complicaciones a largo plazo.

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          Postoperative delirium: the importance of pain and pain management.

          Postoperative delirium is common in geriatric patients. Few studies have examined events in the postoperative period that may contribute to the occurrence of postoperative delirium. We hypothesized that postoperative delirium is related to postoperative pain and/or pain management strategy. Patients aged > or =65 years who were scheduled for major noncardiac surgery were studied. A structured interview was conducted preoperatively and for the first 3 postoperative days to determine the presence of delirium using the Confusion Assessment Method. The method of postoperative pain management, as well as pre- and postoperative medications for the first 3 days, was collected. Pre- and postoperative pain at rest and with movement was recorded using the Visual Analog Scale. Three hundred thirty-three patients, with a mean age of 74 +/- 6 years, were studied. After surgery, 46% of patients developed postoperative delirium. By multivariate logistic regression, age (odds ratio [OR], 2.5; 95% confidence interval [CI] 1.5 to 4.2), moderate (OR, 2.2; 95% CI 1.2 to 4.0) and severe (OR, 3.7; 95% CI 1.5 to 9.0) preoperative resting pain, and increase in level of pain from baseline to postoperative day one (OR, 1.1; 95% CI 1.01 to 1.2) were independently associated with a greater risk for the development of postoperative delirium. In contrast, patients who used oral opioid analgesics as their sole means of postoperative pain control were at decreased risk of developing delirium in comparison with those who used opioid analgesics via IV patient-controlled analgesia technique (OR, 0.4; 95% CI 0.2 to 0.7). These results validate our hypothesis that pain and pain management strategies are important factors related to the development of postoperative delirium in elderly patients.
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            Postoperative cognitive disorders.

            The elderly are the fastest growing segment of the population and undergo 25-30% of all surgical procedures. Postoperative cognitive problems are common in older patients following major surgery. The socioeconomic implications of these cognitive disorders are profound; cognitive decline is associated with a loss of independence, a reduction in the quality of life, and death. This review will focus on the two most common cognitive problems following surgery: postoperative delirium and postoperative cognitive dysfunction (POCD). For years, preoperative geriatric consultation/screening was the only intervention proven to decrease postoperative delirium. There are, however, several recent publications indicating that preoperative and postoperative pharmacological and medical (hydration, oxygenation) management can reduce postoperative delirium. Spinal anesthesia with minimal propofol sedation has been shown to decrease the incidence of postoperative delirium in hip-fracture patients. Likewise, dexmedetomidine sedation in mechanically ventilated patients in the ICU is associated with less postoperative delirium and shorter ventilator times. Preoperative levels of education and brain function (cognitive reserve) may predict patients at risk for postoperative cognitive problems. Reduced white matter integrity is reported to place patients at a higher risk for both postoperative delirium and POCD. The etiology of postoperative cognitive problems is unknown, but there is emerging evidence that decreased preoperative cognitive function contributes to the development of postoperative delirium and POCD. There is growing concern that inhalation anesthetics may be neurotoxic to the aging brain, but there are no human data evaluating this hypothesis to date. Randomized controlled trials evaluating interventions to improve long-term cognitive outcomes in elderly patients are urgently needed.
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              Adverse cerebral effects of anaesthesia on old people.

              P. Bedford (1955)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rca
                Revista Colombiana de Anestesiología
                Rev. colomb. anestesiol.
                SCARE-Sociedad Colombiana de Anestesiología y Reanimación (Bogotá, Cundinamarca, Colombia )
                0120-3347
                December 2018
                : 46
                : 4
                : 273-278
                Affiliations
                [1] Ciudad Obregon orgnameHospital General Regional No. 1 orgdiv1Instituto Mexicano del Seguro Social orgdiv2Department of Health Education and Research Mexico
                [2] Ciudad Obregon orgnameInstituto Mexicano del Seguro Social orgdiv1Department of Anesthesiology Mexico
                Article
                S0120-33472018000400273
                10.1097/cj9.0000000000000077
                701a6e26-6d07-4f4c-aabe-7328a00fa675

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 6
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                SciELO Colombia

                Categories
                Scientific and technological research

                Health of the Elderly,Estudios transversales,Anestesia,Delirio,Delirium,Periodo Posoperatorio,Anesthesia,Cross-Sectional Studies,Postoperative Period,Salud del anciano

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